Fix InnoDB/XtraDB warnings by GCC 8.2.0

storage/innobase/buf/buf0dump.cc

@@ -203,7 +203,7 @@ buf_dump(
 #define SHOULD_QUIT()	(SHUTTING_DOWN() && obey_shutdown)
 
 	char	full_filename[OS_FILE_MAX_PATH];
-	char	tmp_filename[OS_FILE_MAX_PATH];
+	char	tmp_filename[OS_FILE_MAX_PATH + sizeof "incomplete"];
 	char	now[32];
 	FILE*	f;
 	ulint	i;

storage/innobase/handler/i_s.cc

@@ -1452,19 +1452,16 @@ i_s_cmp_fill_low(
 		clear it.  We could introduce mutex protection, but it
 		could cause a measureable performance hit in
 		page0zip.cc. */
-		table->field[1]->store(
-			static_cast<double>(zip_stat->compressed));
-		table->field[2]->store(
-			static_cast<double>(zip_stat->compressed_ok));
-		table->field[3]->store(
-			static_cast<double>(zip_stat->compressed_usec / 1000000));
-		table->field[4]->store(
-			static_cast<double>(zip_stat->decompressed));
-		table->field[5]->store(
-			static_cast<double>(zip_stat->decompressed_usec / 1000000));
+		table->field[1]->store(zip_stat->compressed, true);
+		table->field[2]->store(zip_stat->compressed_ok, true);
+		table->field[3]->store(zip_stat->compressed_usec / 1000000,
+				       true);
+		table->field[4]->store(zip_stat->decompressed, true);
+		table->field[5]->store(zip_stat->decompressed_usec / 1000000,
+				       true);
 
 		if (reset) {
-			memset(zip_stat, 0, sizeof *zip_stat);
+			new (zip_stat) page_zip_stat_t();
 		}
 
 		if (schema_table_store_record(thd, table)) {

storage/innobase/row/row0import.cc

@@ -105,18 +105,18 @@ struct row_index_t {
 struct row_import {
 	row_import() UNIV_NOTHROW
 		:
-		m_table(),
-		m_version(),
-		m_hostname(),
-		m_table_name(),
-		m_autoinc(),
-		m_page_size(),
-		m_flags(),
-		m_n_cols(),
-		m_cols(),
-		m_col_names(),
-		m_n_indexes(),
-		m_indexes(),
+		m_table(NULL),
+		m_version(0),
+		m_hostname(NULL),
+		m_table_name(NULL),
+		m_autoinc(0),
+		m_page_size(0),
+		m_flags(0),
+		m_n_cols(0),
+		m_cols(NULL),
+		m_col_names(NULL),
+		m_n_indexes(0),
+		m_indexes(NULL),
 		m_missing(true) { }
 
 	~row_import() UNIV_NOTHROW;
@@ -3558,8 +3558,6 @@ row_import_for_mysql(
 
 	row_import	cfg;
 
-	memset(&cfg, 0x0, sizeof(cfg));
-
 	err = row_import_read_cfg(table, trx->mysql_thd, cfg);
 
 	/* Check if the table column definitions match the contents

storage/innobase/trx/trx0trx.cc

@@ -2145,6 +2145,7 @@ trx_get_trx_by_xid_low(
 
 		if (trx->is_recovered
 		    && trx_state_eq(trx, TRX_STATE_PREPARED)
+		    && !trx->xid.is_null()
 		    && xid->gtrid_length == trx->xid.gtrid_length
 		    && xid->bqual_length == trx->xid.bqual_length
 		    && memcmp(xid->data, trx->xid.data,
@@ -2152,8 +2153,7 @@ trx_get_trx_by_xid_low(
 
 			/* Invalidate the XID, so that subsequent calls
 			will not find it. */
-			memset(&trx->xid, 0, sizeof(trx->xid));
-			trx->xid.formatID = -1;
+			trx->xid.null();
 			break;
 		}
 	}

storage/innobase/trx/trx0undo.cc

@@ -1314,8 +1314,7 @@ trx_undo_mem_create_at_db_start(
 	/* Read X/Open XA transaction identification if it exists, or
 	set it to NULL. */
 
-	memset(&xid, 0, sizeof(xid));
-	xid.formatID = -1;
+	xid.null();
 
 	if (xid_exists == TRUE) {
 		trx_undo_read_xid(undo_header, &xid);

storage/xtradb/buf/buf0dump.cc

@@ -203,7 +203,7 @@ buf_dump(
 #define SHOULD_QUIT()	(SHUTTING_DOWN() && obey_shutdown)
 
 	char	full_filename[OS_FILE_MAX_PATH];
-	char	tmp_filename[OS_FILE_MAX_PATH];
+	char	tmp_filename[OS_FILE_MAX_PATH + sizeof "incomplete"];
 	char	now[32];
 	FILE*	f;
 	ulint	i;

storage/xtradb/handler/i_s.cc

@@ -1458,19 +1458,16 @@ i_s_cmp_fill_low(
 		clear it.  We could introduce mutex protection, but it
 		could cause a measureable performance hit in
 		page0zip.cc. */
-		table->field[1]->store(
-			static_cast<double>(zip_stat->compressed));
-		table->field[2]->store(
-			static_cast<double>(zip_stat->compressed_ok));
-		table->field[3]->store(
-			static_cast<double>(zip_stat->compressed_usec / 1000000));
-		table->field[4]->store(
-			static_cast<double>(zip_stat->decompressed));
-		table->field[5]->store(
-			static_cast<double>(zip_stat->decompressed_usec / 1000000));
+		table->field[1]->store(zip_stat->compressed, true);
+		table->field[2]->store(zip_stat->compressed_ok, true);
+		table->field[3]->store(zip_stat->compressed_usec / 1000000,
+				       true);
+		table->field[4]->store(zip_stat->decompressed, true);
+		table->field[5]->store(zip_stat->decompressed_usec / 1000000,
+				       true);
 
 		if (reset) {
-			memset(zip_stat, 0, sizeof *zip_stat);
+			new (zip_stat) page_zip_stat_t();
 		}
 
 		if (schema_table_store_record(thd, table)) {

storage/xtradb/row/row0import.cc

@@ -105,18 +105,18 @@ struct row_index_t {
 struct row_import {
 	row_import() UNIV_NOTHROW
 		:
-		m_table(),
-		m_version(),
-		m_hostname(),
-		m_table_name(),
-		m_autoinc(),
-		m_page_size(),
-		m_flags(),
-		m_n_cols(),
-		m_cols(),
-		m_col_names(),
-		m_n_indexes(),
-		m_indexes(),
+		m_table(NULL),
+		m_version(0),
+		m_hostname(NULL),
+		m_table_name(NULL),
+		m_autoinc(0),
+		m_page_size(0),
+		m_flags(0),
+		m_n_cols(0),
+		m_cols(NULL),
+		m_col_names(NULL),
+		m_n_indexes(0),
+		m_indexes(NULL),
 		m_missing(true) { }
 
 	~row_import() UNIV_NOTHROW;
@@ -3558,8 +3558,6 @@ row_import_for_mysql(
 
 	row_import	cfg;
 
-	memset(&cfg, 0x0, sizeof(cfg));
-
 	err = row_import_read_cfg(table, trx->mysql_thd, cfg);
 
 	/* Check if the table column definitions match the contents

storage/xtradb/trx/trx0trx.cc

@@ -2421,6 +2421,7 @@ trx_get_trx_by_xid_low(
 
 		if (trx->is_recovered
 		    && trx_state_eq(trx, TRX_STATE_PREPARED)
+		    && !trx->xid.is_null()
 		    && xid->gtrid_length == trx->xid.gtrid_length
 		    && xid->bqual_length == trx->xid.bqual_length
 		    && memcmp(xid->data, trx->xid.data,
@@ -2428,8 +2429,7 @@ trx_get_trx_by_xid_low(
 
 			/* Invalidate the XID, so that subsequent calls
 			will not find it. */
-			memset(&trx->xid, 0, sizeof(trx->xid));
-			trx->xid.formatID = -1;
+			trx->xid.null();
 			break;
 		}
 	}

storage/xtradb/trx/trx0undo.cc

@@ -1314,8 +1314,7 @@ trx_undo_mem_create_at_db_start(
 	/* Read X/Open XA transaction identification if it exists, or
 	set it to NULL. */
 
-	memset(&xid, 0, sizeof(xid));
-	xid.formatID = -1;
+	xid.null();
 
 	if (xid_exists == TRUE) {
 		trx_undo_read_xid(undo_header, &xid);